2. Ion-chamber~type surveymeter: calibration Operation, use, and 3. Geiger-Mueller-type survey meter: and calibration 4. Shielding properties of common materials: Effect of various absorbers of gamma radiation and determination of their absorption coefficient and half-thickness 5. Maintenance of instruments: Basic concepts of maintenance and some of the details of maintenance applicable to the Geiger-Mueller counter and ion~-chambertype instruments 6. Decontamination: PFamiliarization with some of the methods used in the decontamination of radiologically contaminated materials, use of a few of these methods, and comparisons of the results 7. Field monitoring: Practice in monitoring of large contaminated areas and plotting of isointensity lines by comparing the results of rapid and detailed surveys 8. Problems: Introduction to the calculations necessary for the solution of exposure and time-of-stay problems through the use of radiation-calculator slide rules and tables. Operation, use, The second and third schools at Bikini and Enewetak were attended by much smaller groups that received a 1-day condensed version of the exercises. These secondary courses were considered emergency supplementary instruction. Instructors were TU 7 personnel. The lack of continuity in operations and the loss of experienced personnel between operations necessitated the establishment of a training program for unit laboratory technicians, photodosimetry technicians, and radiological~instrument repairmen. Schooling for instrument repairmen was arranged through JTF 7 and AFSWP at the Naval Schools Command, Treasure Island, San Francisco, and consisted of 1 month of instruction in the maintenance and repair of military radiac instruments. All TG 7.1 repair- men were graduates of this school. Arrangements were made with the Nucleonics Branch of the Signal Corps Engineering Laboratories to conduct familiarization courses with mobile field laboratories for the laboratory and photodosimetry technicians. 91